Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.9, and surface temperature is 32°C. Determine the total rate of heat loss from that person by radiation and convection in a large room having walls at a temperature of 18oC. The convective heat transfer coefficient is 5 W/m2.K.

Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.